Winder drive



Aprire', 1946. R, TYLER 2,398,265

WINDER DRIVE Filed Feb. 28,` 1945 AroRNEY Patented Apr.; 9, 1946 f wat,

Nr OFFICE .WINDER DRIVE Ransom Tyier, Greenileld, Wis., assignor to Thel Oilgear Company, Milwaukee, Wis., a corporation of-WisconsinApplication February 28, 1945, Serial lNo. 580,238

l2 Claims.

This. invention relates to hydraulic drives of the type employed todrive a winding roll upon which strip material is wound as fast as it isdelivered thereto from another machine orfrom another part ofthe samemachine of which the winding roll forms a part.

v A Winder drive must maintain tension upon the strip during the windingoperation and the tension must be maintained within certain limits inorder to produce a nished roll of strip material having the) properdensity and to prevent the inner turns ,'oftliezstrip from movingaxially during the winding of the outer turns.

The present invention has as an objectto provide a hydraulic drive whichwill wind strip material into large diameter rolls upon small diametercores and maintain the tension upon the strip within the proper limits.

Other objects and advantages will appear from the following descriptionof an embodiment of I the invention shown schematically in theaccompanying drawing. l

The drive chosen for illustration is adapted to drive the winding shaftI of a machine which winds a sheet or strip 2 of material into a roll asit is delivered thereto by the delivery rolls 3- of the same or adifferent machine. Since the machine or machines form no part of thepresent invention, only the winding shaft and the de-l livery rollsthereof have been shown in the drawing.

As shown, 'winding shaft I is adapted to be driven by a hydraulic motor4 throughl a suitable drive 5 and also by a second hydraulic motor 6through a suitable drive 1 which should include an overrunning clutch 8.-JDrives 5 and 1 have tor E through an adjustable choke "I5 and anadjustable resistance valve I6 which are connected in series betweenchannels II and I2. Chokes- I3' and I5 are preferably of the orificetype.

Operation 'I'he end of the strip extending through delivery roll 3 isfastened to a core on a shaft I with as little slack as possible.Delivery rolls 3- are then started and pump `9 will start to operate.'I'he liquid delivered by pump 9 will flow through channel IU and causemotor d to rotate shaft I which will wind strip Zthereon.

Resistance valve Id will at rst prevent .de-v livery of liquid to motorv6 so that all the liquid discharged by pump Q will flow to motor 4 untilthe slack is pulled .out of strip 2' and tension is exerted thereon.`The pull on strip 2 will cause pump pressure to rise high enough toopen resistance valve Id which is adjusted to open at the pressurenecessary to enable motor 4 to have just enough torque to exert theproper tension upon strip 2 when the roll of material upon shaft I is ofminimum diameter.- Overrunning clutch 8 ypermits motor 4 to drive shaftI independently of motor 6.

As delivery rolls 3 accelerate to full speed, the speed and volumetricdelivery of pump 9 will correspondingly increase and cause motor I torun been shown as being of the belt and pulley type solely for `thepurpose of illustration as any suitable "type of drive will sumce. Drivel has been shown as having a greater ratio than drive 5v so pump 9 by achannel III and its outlet connected to a channel II through whichliquid is returned f to pump l9. Motor i has its outlet connected tochannel II and its inlet connected to channel III by a channell I2 andan adjustable choke I3 and 'an adjustable resistance valve I 4 which areconthat motor 8 will'run faster than motor 4 when fast enough to wind upstrip 2 and to maintain tension thereon. The liquid discharged by pump 9in excess of the liquid required to operate motor 4 ilows through chokeI3, resistance valve Il and channel I 2 to motor and causes it tooperate-but it will not run fast enough to assist in driving shaft I'until the roll of material thereon reaches a predetermined diameter.For example, if the core on shaft I is three inches in diameter, theparts may be so proportioned that motor i is not effective until theroll of material on shaft I is about seven and one half inches indiameter;

As the roll of material upon shaft I gradually increases in diameter,more motor torque is required to rotate it and its rotary speeddecreases relative to its peripheral speed and 'causes the increase. f

nected in series. Liquid is bypassed around mo- Continued rotation ofshaft I causes the roll of material thereon to gradually increase indiameter so that the motor torque must gradually increase in order tomaintain tension upon strip 2.' Since strip 2 is delivered to shaft I ata substantially uniform rate after the machine is I of liquidtherethroughis small when the roll l of material on shaft I is ofminimum diameter but, as the ow therethrough gradually increases due tothe roll of material gradually increasing f in diameter, the resistanceof choke I3 gradually increases and causes pump pressure to graduallyincrease and thereby gradually increase the torque ofV motor 4 so thattension is maintained upon strip 2.

All of the liquid bypassed through choke I3 f and resistance valve I4enters motor 6 but the rate of flow is insufficient to cause motor 6 to4operate fast enough to assist in driving shaft I until the roll ofmaterial reaches a predetermined diameter so that at this time thepressure in channel' I2 is just high enough to cause motor 6 to operateidly. v

When the roll of material on shaft Ireaches the predetermined diameter,the speed of motor 4 will have been decreased to such an extent `thatthe flow of liquidtlrroughr choke I3 and resistance valve I4 will havebeen increased sufyilciently to cause motor 6 to operate fast enough topick up the load through overrunning clutch Il. Shaft I will then bedriven by both motors.

Since the speed of motor 4 is gradually decreasing so that theow ofliquid to motor 6 is graduallyincreasing, motor 6 will tend toaccelerate but its speed will be limited by the speed of strip 2. 'I'heresistance offered by strip 2 to the operation of motor 6 causes thepressure in channel I2 to rise and open resistance valve I6 and then theliquid delivered to motor 6 in excess of its requirements ows 'throughchoke I5 and resistance valve I6 into return channell I. The resistanceoffered by choke I5 is negligible at first for the reason that the flowtherethrough is very small at rst but the speeds of motors 4 and 6 willgradually decrease as the roll ofmaterial on shaft I gradually increasesso that the ilow through choke i I5 gradually increases and therebycauses pump pressure to gradually increase and enable motors 4 arid 6 tomaintain tension upon strip 2.

The tension' on strip 2 is thus-automatically it is delivered thereto,comprising a pump, .a first hydraulic motor connected to said pump, arst drive connecting said motor to said shaft, a second hydraulic motor,a second drive connecting said second motor to said shaft andincludingan overrunning clutch, means for delivering liquid from said pump tosaid second motor including means to resist `the flow of liquid thereto,and resistance means for bypassing liquid around said second motor.

2. A transmission for driving a shaft upon which strip material is to bewound as fast as it is delivered thereto, comprising a pump, a :Iirsthydraulic motor connected to said pump, a rst drive connecting s'aidmotor to said shaft, a second hydraulic motor, a second drive having agreater ratio than said first drive connecting said second motor to saidshaft and including an overrunning clutch, means for delivering liquidfrom said pump to said second motor including means to resist the tlowof liquid thereto, and resistance means for bypassing liquid around saidsecond motor.

3. A transmission for driving a shaft upon which strip material is to bewound as fast as it is delivered thereto, comprising a pump, a viirsthydraulic motor connected to said pump, a first drive connecting saidmotor to said shaft, a second hydraulic motor, a second drive connectingsaid second motorto said shaft and including an overrunning clutch,means connecting said second motor to said pump in parallel with saidfirst motor and including a choke and a resistance valve connected inseries between said second motor and said pump, ard resistance means forbypassing liquid around said secondmotor.

4. A transmission for driving a shaft upon which strip material is to bewound as fast as it is delivered thereto, comprising a pump, a firsthydraulic motor connected to said pump, a first drive connecting saidmotor to said shaft, a second hydraulic motor, a second drive having agreater ratio than said .first drive connecting controlled by chokes I3and I5 and resistance valves I4 and I6 which are preadjusted to providea tension of the desired characteristics. If a strip is to be wound intoa roll of large diameter upon a small diameter core, such as a roll tentimes the diameter of the core, the chokes and resistance valves arepreferably so adjusted that the tension upon the strip is maximum at thebeginning of winding operation and automatically decreases .as theroll-increases in diameter so as to preventthe inner turns of the stripfrom moving axially during the winding of subfl sequent turns of thestrip. n A

A hydraulic drive constructed according to the invention is capable ofwinding larger rolls of the proper density upon relatively small coresthan is possible with the priorhydraulic drives. The Winder drivedescribed herein may be modified in various ways and adapted to varioususes without departing from the scope of the invention which is herebyclaimed as follows: f

1. A transmission for driving a shaft upon which strip material is to bewound as fast as said second motor to said shaft and including anoverrunning clutch, means connecting said second motor to said pump inparallel with said first motor and including a choke and a resistancevalve connected in series between said second motor and said pump, andresistance' means for by passing liquid around said second motor.

5. A transmission for. drivingA a shaft upon which strip material is tobe wound as fast as it is delivered thereto, comprising a pump, a iirsthydraulic motor connected to said pump, a rst drive connecting saidmotor to said shaft. a second hydraulic motor, a second drive connectingsaid second motor to said shaft and'including an overrunning clutch,means for delivering liquid from said pump to said second motorincluding means to resist the flow' of liquid thereto, and meansincluding a choke and a resistance valve for bypassing liquid aroundsaid second motor.

6. A transmission for driving a shaft upon which strip material is to bewound as-fast as second motor and said pump, and means including a chokeand a resistance valve for bg liquid around said second motor. L

7. A transmission for' driving a shaft upon which strip material is tobe wound as fast'as it is delivered thereto .by a machine, comprisingsecond motor.

8. A transmission for driving a shaft uponn which' strip. material is tobe wound as fast as it is delivered thereto by a machine, comprising apumpdriven by said machine, a first hydraulic motor connected to saidpump, a `irst drive connecting said motor to said shaft, a secondhydraulic motor, a second drive having a greater ratio than saidrstdrive connecting said second motor to said shaft and including anoverrunning 'v clutch, means 'for delivering liquidfrom said pump tosaid second motor including .means-to resist thencw of liquid thereto,and resistance means for bypassing liquid around said second mot'on i 9.A' transmission for driving a shaft upon which strip material is to bewound as fast as 4it is delivered thereto by a machine, comprising apump driven by said machine, a rst hydraulic motor connected to saidpump, 'a' rst drive-connecting said motor to said shaft. a secondhydraulic motor, a second drive connecting said second motor to saidshaft and including an overrunning clutch, means connecting said secondmotor to said pump in parallel with Asaid rst motor and including achoke and a resistance valve connected in series between said secondmotor and said pump, and resistance means for ing liquid around saidsecond motor.

10. A transmission for driving a shaft upon which strip material is tobe wound as fast as it is delivered thereto by a machine, comprising apump driven by said machine, a first hydraulic motor connected to saidpump, a first drive connecting said motor to said shaft, a secondhydraulic motor, a second drive having a greater ratio than said firstdrive connecting said second motor to said shaft and including anoverrunning clutch, means connecting said second motor to said pump inparallel with said rst motor and including a choke and a resistancevalve connected in series between said second motor and said pump, andresistance means for bypassing liquidA around said second motor.

1l. A transmission for driving a shaft upon which strip. material is tobe wound as fast as it is delivered thereto by a machine,'comprisins a.pump driven by'said machine, a first hydraulic moto;` connected to saidpump, arst drive connesting said motor to said shaft, a second hydraulicmotor, a second drive connecting said second motor to said shaft andincluding an overrunning clutch,- means for delivering liquid from saidpump to said second motor including means to resist the flow of liquidthereto, and. means including a choke and a resistance valve vforbypassing liquid around said second motor.

12. A transmission for driving a shaft upon which strip material is tobe wound as fast as it is delivered thereto by a machine, comprising v ia pump driven by said machine, a rst hydraulic motor connected to saidpump, a ilrst drive connecting said motor to said shaft, .a secondhydraulic motor, a second drive having a greater ratio than said firstdrive connecting said second motor to said shaft and including anoverrunning clutch, means connecting said second motor to said pump inparallel with said first motor and including a choke andV a resistancevalve connected in series between said secondinotor and said pump, andmeans including a choke and a resistance valve fu' bypassing liquidaround said second motor. i

' RANSOM TYLER..

